110318-opp - 3/18/11 Physics 122 1 3/18/11 Physics 122 2 y...

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Unformatted text preview: 3/18/11 Physics 122 1 3/18/11 Physics 122 2 y = A sin( kx1 y = A sin( 1 3/14/11 t ) + A sin( kx2 t) t ) + A sin( 2 t) Physics 122 x1 x2 3 a D When D = n , waves add. When D = (n+1/2) , waves cancel 3/29/10 Physics 122 4 3/16/11 Physics 122 5 At the correct angle, the light from each slit interferes constructively. We get N2 times the intensity of a single slit. a D 3/18/11 Physics 122 6 3/16/11 Physics 122 7 When the distance traveled by the wavelet from the middle of the slit is half a wavelength greater than the distance traveled by the wavelet from the top of the slit every wavelet from the top half of the slit has a canceling wavelet from the bottom half of the slit. d d/2 D 3/16/11 Physics 122 The result is no intensity at that angle. 8 D=0 D = /2 D= d/2 D 3/16/11 Physics 122 9 3/18/11 Physics 122 10 When the angular separation between points is greater than the angle to the first diffraction minimum, the points can be separated. This is called the Rayleigh resolution criterion. The minimum of a diffraction pattern occurs at an angle 3/18/11 Physics 122 11 The separation of the dots is about 0.25 cm. The diameter of the pupil of the eye is ~0.25 cm. How far do you have to stand for the dots to blend? 3/18/11 Physics 122 12 http://www.folksemantic.com/visits/71765 3/18/11 Physics 122 13 3/18/11 Physics 122 16 ...
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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